Enjoyment: 2/5. There isn't much to do, you just collect the little dots. eventually as they get rarer even that becomes grueling
Creativity: 3/5. The way you describe it as an "anti-danmaku" is really cool, but unfortunately it pretty much boils down to catching things that fall from the sky.
Presentation: 4/5. The music and graphics reminded me of old flash games. Really cool !